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is the explaination of given question correct?

Explanation:

Result of inner query is non empty because even no record satisfy where condition of inner query count(*) produces 1 record.

So, every record of R  where condition true

My question: how count getting 1 record?

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radha gogia asked Aug 5, 2015
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Weak entity set avoids the data duplication and consequent possible inconsistencies caused by duplicating the key of the strong entity..plz clarify this........